Hi,
Do you know about maven? I have a post that explains how to set up your project to use jBPM5 and the dependencies that you need to add.
For humant ask you have several options. You can start the human task service and when your application starts you need to do some small configurations in order to communicate your business process with the human task service.
Check the following examples to know how to setup your webapp to use the jbpm5 dependencies.
https://github.com/Salaboy/Drools_jBPM5-Training-Examples/blob/master/jbpm5/02-jBPM5-SimpleEmergencyServiceProcessWorkItemsExamples/pom.xml
You will only need to change the type (<packaging>) of the project to war.